Siliceous ZSM-5 membranes by secondary growth of b-oriented seed layers

Zhiping Lai*, Michael Tsapatsis, Jeffrey P. Nicolich

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

252 Scopus citations


A modified seeded growth procedure, which allowed us to prepare the first functional, b-oriented siliceous ZSM-5 membrane (Z. Lai et al., Science, 2003, 300, 456), is described and discussed in detail. The procedure involves growing a b-oriented ZSM-5 seed monoläyer into a dense b-oriented membrane. Preservation of the orientation is achieved by enhancing the growth rate of siliceous ZSM-5 crystals along the b-axis using trimer-TPAOH (bis-N.N-(tripropylammoniumhexamethylene) di-N-N-propylammonium trihydroxide) as the structure-directing agent (SDA). Under similar synthesis conditions but using monomer-TPAOH (tetrapropylammonium hydroxide) as the SDA for the secondary growth of the b-oriented seed layer, two other films with mixed grain orientations, namely b&a- or b&a&h0h/c-oriented ZSM-5 membranes were obtained depending on temperature of the secondary growth. Membrane microstructures were characterized by X-ray diffraction, pole figure analysis, scanning electron microscopy, fluorescent confocal optical microscopy, electron probe microanalysis, and X-ray photoelectron spectroscopy. The separation performance, of the three types of membranes was tested by using a mixture of xylene isomers. Significant improvement in both permeance and separation factor is achieved by the b-oriented siliceous ZSM-5 membrane compared to the other two types of membranes described here or other reported ZSM-5 membranes in the literature. The permeation results indicate that the membrane performance depends strongly on membrane microstructure.

Original languageEnglish (US)
Pages (from-to)716-729
Number of pages14
JournalAdvanced Functional Materials
Issue number7
StatePublished - Jul 2004
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Chemistry
  • Condensed Matter Physics
  • General Materials Science
  • Electrochemistry
  • Biomaterials


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